Hello My 03 Cab 3.0 sport manual has been a brilliantly reliable vehicle from new but recently has developed a strange and worrying problem. somewhere inside the driver side rear quarter panel around mid wheel arch emminates a strange clicking noise that never stops even when the car is stationary and parked and locked. The noise sometimes becomes a buzz and then after sometime goes back to clicking which itself can increase in frequency or die away to 1 click every second or so. The sound is kind of electromagnetic or similar to the noise that a solenoid or relay can make. This doesn't seem to affect the roof operation in any way but I have noticed that on occasion the central Locking becomes non responsive and may not respond until I put the key in the ignition and switch the ignition on. This may be a red herring but I thought I would mention this just in case. No other symptoms have been noticed. I wanted to pick the brains and experience of you fine Audi people before dragging my butt into a stealer for a fix. Any advice gratefully recieved. Thank you.